<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
<style>
	// css注释
	/*
	h1{
		color:red;
	}
	*/
</style>
</head>
<body>
<h1>1. JSP注释</h1>
<%-- 
	out.println("Hello world");
--%>
<h1>2. java注释</h1>
<%
	//out.println("Hello world");
%>
<h1>3. html注释</h1>
<!--  
	<p>Hello world</p>
 -->
<h1>4. js</h1>
<script type="text/javascript">
	//var x = 10;
	//document.write("x="+ x);
</script>

<h1>5. css</h1>
</body>
</html>